<template>
    <view class="uni-data-tree">
        <view class="uni-data-tree-input" @click="handleInput">
            <slot :options="options" :data="inputSelected" :error="errorMessage">
                <view class="input-value" :class="{ 'input-value-border': border }">
                    <text v-if="errorMessage" class="selected-area error-text">{{ errorMessage }}</text>
                    <view v-else-if="loading && !isOpened" class="selected-area">
                        <uni-load-more class="load-more" :contentText="loadMore" status="loading"></uni-load-more>
                    </view>
                    <scroll-view v-else-if="inputSelected.length" class="selected-area" scroll-x="true">
                        <view class="selected-list">
                            <view class="selected-item" v-for="(item, index) in inputSelected" :key="index">
                                <text class="text-color">{{ item.text }}</text>
                                <text v-if="index < inputSelected.length - 1" class="input-split-line">{{ split }}</text>
                            </view>
                        </view>
                    </scroll-view>
                    <text v-else class="selected-area placeholder">{{ placeholder }}</text>
                    <view v-if="clearIcon && !readonly && inputSelected.length" class="icon-clear" @click.stop="clear">
                        <uni-icons type="clear" color="#c0c4cc" size="24"></uni-icons>
                    </view>
                    <view class="arrow-area" v-if="(!clearIcon || !inputSelected.length) && !readonly">
                        <view class="input-arrow"></view>
                    </view>
                </view>
            </slot>
        </view>
        <view class="uni-data-tree-cover" v-if="isOpened" @click="handleClose"></view>
        <view class="uni-data-tree-dialog" v-if="isOpened">
            <view class="uni-popper__arrow"></view>
            <view class="dialog-caption">
                <view class="title-area">
                    <text class="dialog-title">{{ popupTitle }}</text>
                </view>
                <view class="dialog-close" @click="handleClose">
                    <view class="dialog-close-plus" data-id="close"></view>
                    <view class="dialog-close-plus dialog-close-rotate" data-id="close"></view>
                </view>
            </view>
            <data-picker-view
                :tagTitle="tagTitle"
                class="picker-view"
                ref="pickerView"
                v-model="dataValue"
                :localdata="localdata"
                :preload="preload"
                :collection="collection"
                :field="field"
                :orderby="orderby"
                :where="where"
                :step-searh="stepSearh"
                :self-field="selfField"
                :parent-field="parentField"
                :managed-mode="true"
                :map="map"
                :ellipsis="ellipsis"
                @change="onchange"
                @datachange="ondatachange"
                @nodeclick="onnodeclick"
            ></data-picker-view>
        </view>
    </view>
</template>

<script>
import dataPicker from '../uni-data-pickerview/uni-data-picker.js';
import DataPickerView from '../uni-data-pickerview/uni-data-pickerview.vue';

/**
 * DataPicker 级联选择
 * @description 支持单列、和多列级联选择。列数没有限制，如果屏幕显示不全，顶部tab区域会左右滚动。
 * @tutorial https://ext.dcloud.net.cn/plugin?id=3796
 * @property {String} popup-title 弹出窗口标题
 * @property {Array} localdata 本地数据，参考
 * @property {Boolean} border = [true|false] 是否有边框
 * @property {Boolean} readonly = [true|false] 是否仅读
 * @property {Boolean} preload = [true|false] 是否预加载数据
 * @value true 开启预加载数据，点击弹出窗口后显示已加载数据
 * @value false 关闭预加载数据，点击弹出窗口后开始加载数据
 * @property {Boolean} step-searh = [true|false] 是否分布查询
 * @value true 启用分布查询，仅查询当前选中节点
 * @value false 关闭分布查询，一次查询出所有数据
 * @property {String|DBFieldString} self-field 分布查询当前字段名称
 * @property {String|DBFieldString} parent-field 分布查询父字段名称
 * @property {String|DBCollectionString} collection 表名
 * @property {String|DBFieldString} field 查询字段，多个字段用 `,` 分割
 * @property {String} orderby 排序字段及正序倒叙设置
 * @property {String|JQLString} where 查询条件
 * @event {Function} popupshow 弹出的选择窗口打开时触发此事件
 * @event {Function} popuphide 弹出的选择窗口关闭时触发此事件
 */
export default {
    name: 'UniDataPicker',
    emits: ['popupopened', 'popupclosed', 'nodeclick', 'input', 'change', 'update:modelValue', 'inputclick'],
    mixins: [dataPicker],
    components: {
        DataPickerView
    },
    props: {
        options: {
            type: [Object, Array],
            default() {
                return {};
            }
        },
        popupTitle: {
            type: String,
            default: '请选择'
        },
        placeholder: {
            type: String,
            default: '请选择'
        },
        heightMobile: {
            type: String,
            default: ''
        },
        readonly: {
            type: Boolean,
            default: false
        },
        clearIcon: {
            type: Boolean,
            default: true
        },
        border: {
            type: Boolean,
            default: true
        },
        split: {
            type: String,
            default: '/'
        },
        ellipsis: {
            type: Boolean,
            default: true
        }
    },
    data() {
        return {
            isOpened: false,
            inputSelected: []
        };
    },
    created() {
        this.$nextTick(() => {
            this.load();
        });
    },
    watch: {
        localdata: {
            handler() {
                this.load();
            },
            deep: true
        }
    },
    methods: {
        clear() {
            this._dispatchEvent([]);
        },
        onPropsChange() {
            this._treeData = [];
            this.selectedIndex = 0;

            this.load();
        },
        load() {
            if (this.readonly) {
                this._processReadonly(this.localdata, this.dataValue);
                return;
            }

            // 回显本地数据
            if (this.isLocalData) {
                this.loadData();
                this.inputSelected = this.selected.slice(0);
            } else if (this.isCloudDataList || this.isCloudDataTree) {
                // 回显 Cloud 数据
                this.loading = true;
                this.getCloudDataValue()
                    .then((res) => {
                        this.loading = false;
                        this.inputSelected = res;
                    })
                    .catch((err) => {
                        this.loading = false;
                        this.errorMessage = err;
                    });
            }
        },
        show() {
            this.isOpened = true;
            setTimeout(() => {
                this.$refs.pickerView.updateData({
                    treeData: this._treeData,
                    selected: this.selected,
                    selectedIndex: this.selectedIndex
                });
            }, 200);
            this.$emit('popupopened');
        },
        hide() {
            this.isOpened = false;
            this.$emit('popupclosed');
        },
        handleInput() {
            if (this.readonly) {
                this.$emit('inputclick');
                return;
            }
            this.show();
        },
        handleClose(e) {
            this.hide();
        },
        onnodeclick(e) {
            this.$emit('nodeclick', e);
        },
        ondatachange(e) {
            this._treeData = this.$refs.pickerView._treeData;
        },
        onchange(e) {
            this.hide();
            this.$nextTick(() => {
                this.inputSelected = e;
            });
            this._dispatchEvent(e);
        },
        _processReadonly(dataList, value) {
            var isTree = dataList.findIndex((item) => {
                return item.children;
            });
            if (isTree > -1) {
                let inputValue;
                if (Array.isArray(value)) {
                    inputValue = value[value.length - 1];
                    if (typeof inputValue === 'object' && inputValue.value) {
                        inputValue = inputValue.value;
                    }
                } else {
                    inputValue = value;
                }
                this.inputSelected = this._findNodePath(inputValue, this.localdata);
                return;
            }

            if (!this.hasValue) {
                this.inputSelected = [];
                return;
            }

            let result = [];
            for (let i = 0; i < value.length; i++) {
                var val = value[i];
                var item = dataList.find((v) => {
                    return v.value == val;
                });
                if (item) {
                    result.push(item);
                }
            }
            if (result.length) {
                this.inputSelected = result;
            }
        },
        _filterForArray(data, valueArray) {
            var result = [];
            for (let i = 0; i < valueArray.length; i++) {
                var value = valueArray[i];
                var found = data.find((item) => {
                    return item.value == value;
                });
                if (found) {
                    result.push(found);
                }
            }
            return result;
        },
        _dispatchEvent(selected) {
            let item = {};
            if (selected.length) {
                var value = new Array(selected.length);
                for (var i = 0; i < selected.length; i++) {
                    value[i] = selected[i].value;
                }
                item = selected[selected.length - 1];
            } else {
                item.value = '';
            }
            if (this.formItem) {
                this.formItem.setValue(item.value);
            }

            this.$emit('input', item.value);
            this.$emit('update:modelValue', item.value);
            this.$emit('change', {
                detail: {
                    value: selected
                }
            });
        }
    }
};
</script>

<style>
.uni-data-tree {
    flex: 1;
    position: relative;
    font-size: 14px;
}

.error-text {
    color: #dd524d;
}

.input-value {
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex-direction: row;
    align-items: center;
    flex-wrap: nowrap;
    font-size: 14px;
    /* line-height: 35px; */
    padding: 0 10px;
    padding-right: 5px;
    overflow: hidden;
    height: 35px;
    /* #ifndef APP-NVUE */
    box-sizing: border-box;
    /* #endif */
}

.input-value-border {
    border: 1px solid #e5e5e5;
    border-radius: 5px;
}

.selected-area {
    flex: 1;
    overflow: hidden;
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex-direction: row;
}

.load-more {
    /* #ifndef APP-NVUE */
    margin-right: auto;
    /* #endif */
    /* #ifdef APP-NVUE */
    width: 40px;
    /* #endif */
}

.selected-list {
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex-direction: row;
    flex-wrap: nowrap;
    /* padding: 0 5px; */
}

.selected-item {
    flex-direction: row;
    /* padding: 0 1px; */
    /* #ifndef APP-NVUE */
    white-space: nowrap;
    /* #endif */
}

.text-color {
    color: #333;
}

.placeholder {
    color: grey;
    font-size: 12px;
}

.input-split-line {
    opacity: 0.5;
}

.arrow-area {
    position: relative;
    width: 20px;
    /* #ifndef APP-NVUE */
    margin-bottom: 5px;
    margin-left: auto;
    display: flex;
    /* #endif */
    justify-content: center;
    transform: rotate(-45deg);
    transform-origin: center;
}

.input-arrow {
    width: 7px;
    height: 7px;
    border-left: 1px solid #999;
    border-bottom: 1px solid #999;
}

.uni-data-tree-cover {
    position: fixed;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.4);
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex-direction: column;
    z-index: 100;
}

.uni-data-tree-dialog {
    position: fixed;
    left: 0;
    /* #ifndef APP-NVUE */
    top: 20%;
    /* #endif */
    /* #ifdef APP-NVUE */
    top: 200px;
    /* #endif */
    right: 0;
    bottom: 0;
    background-color: #ffffff;
    border-top-left-radius: 10px;
    border-top-right-radius: 10px;
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex-direction: column;
    z-index: 102;
    overflow: hidden;
    /* #ifdef APP-NVUE */
    width: 750rpx;
    /* #endif */
}

.dialog-caption {
    position: relative;
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex-direction: row;
    /* border-bottom: 1px solid #f0f0f0; */
}

.title-area {
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    align-items: center;
    /* #ifndef APP-NVUE */
    margin: auto;
    /* #endif */
    padding: 0 10px;
}

.dialog-title {
    /* font-weight: bold; */
    line-height: 44px;
}

.dialog-close {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex-direction: row;
    align-items: center;
    padding: 0 15px;
}

.dialog-close-plus {
    width: 16px;
    height: 2px;
    background-color: #666;
    border-radius: 2px;
    transform: rotate(45deg);
}

.dialog-close-rotate {
    position: absolute;
    transform: rotate(-45deg);
}

.picker-view {
    flex: 1;
    overflow: hidden;
}

.icon-clear {
    display: flex;
    align-items: center;
}

/* #ifdef H5 */
@media all and (min-width: 768px) {
    .uni-data-tree-cover {
        background-color: transparent;
    }

    .uni-data-tree-dialog {
        position: absolute;
        top: 55px;
        height: auto;
        min-height: 400px;
        max-height: 50vh;
        background-color: #fff;
        border: 1px solid #ebeef5;
        box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
        border-radius: 4px;
        overflow: unset;
    }

    .dialog-caption {
        display: none;
    }

    .icon-clear {
        /* margin-right: 5px; */
    }
}

/* #endif */

/* picker 弹出层通用的指示小三角, todo：扩展至上下左右方向定位 */
/* #ifndef APP-NVUE */
.uni-popper__arrow,
.uni-popper__arrow::after {
    position: absolute;
    display: block;
    width: 0;
    height: 0;
    border-color: transparent;
    border-style: solid;
    border-width: 6px;
}

.uni-popper__arrow {
    filter: drop-shadow(0 2px 12px rgba(0, 0, 0, 0.03));
    top: -6px;
    left: 10%;
    margin-right: 3px;
    border-top-width: 0;
    border-bottom-color: #ebeef5;
}

.uni-popper__arrow::after {
    content: ' ';
    top: 1px;
    margin-left: -6px;
    border-top-width: 0;
    border-bottom-color: #fff;
}

/* #endif */
</style>